I must guess you must guess he must guess we must guess you must guess they must guess
Forma con V-ing
I must be guessing you must be guessing he must be guessing we must be guessing you must be guessing they must be guessing
Perfecto
I must have guessed you must have guessed he must have guessed we must have guessed you must have guessed they must have guessed
Perfecto con V-ing
I must have been guessing you must have been guessing he must have been guessing we must have been guessing you must have been guessing they must have been guessing
Negación
Forma simple
I mustn't guess you mustn't guess he mustn't guess we mustn't guess you mustn't guess they mustn't guess
Forma con V-ing
I mustn't be guessing you mustn't be guessing he mustn't be guessing we mustn't be guessing you mustn't be guessing they mustn't be guessing
Perfecto
I mustn't have guessed you mustn't have guessed he mustn't have guessed we mustn't have guessed you mustn't have guessed they mustn't have guessed
Perfecto con V-ing
I mustn't have been guessing you mustn't have been guessing he mustn't have been guessing we mustn't have been guessing you mustn't have been guessing they mustn't have been guessing
Forma interrogativa
Forma simple
must I guess? must you guess? must he guess? must we guess? must you guess? must they guess?
Forma con V-ing
must I be guessing? must you be guessing? must he be guessing? must we be guessing? must you be guessing? must they be guessing?
Perfecto
must I have guessed? must you have guessed? must he have guessed? must we have guessed? must you have guessed? must they have guessed?
Perfecto con V-ing
must I have been guessing? must you have been guessing? must he have been guessing? must we have been guessing? must you have been guessing? must they have been guessing?
Forma interro-negativa
Forma simple
mustn't I guess? mustn't you guess? mustn't he guess? mustn't we guess? mustn't you guess? mustn't they guess?
Forma con V-ing
mustn't I be guessing? mustn't you be guessing? mustn't he be guessing? mustn't we be guessing? mustn't you be guessing? mustn't they be guessing?
Perfecto
mustn't I have guessed? mustn't you have guessed? mustn't he have guessed? mustn't we have guessed? mustn't you have guessed? mustn't they have guessed?
Perfecto con V-ing
mustn't I have been guessing? mustn't you have been guessing? mustn't he have been guessing? mustn't we have been guessing? mustn't you have been guessing? mustn't they have been guessing?